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Ambient Light Sensor IC Series
Digital 16bit Serial Output Type
Ambient Light Sensor IC
BH1715FVC
● Descriptions
BH1715FVC is an digital Ambient Light Sensor IC for I
light data for adjusting LCD and Keypad backlight power of Mobile phone. It is possible to detect wide range at High
resolution. ( 1 - 65535 lx ).
● Features
2
1) I
C bus Interface （ f / s Mode Support ）
2) Spectral responsibility is approximately human eye response
3) Illuminance to Digital Converter
4) Wide range and High resolution. （ 1 – 65535 lx ）
5) Low Current by power down function
6) 50Hz / 60Hz Light noise reject-function
7) 1.8V Logic input interface
8) No need any external parts
9) Light source dependency is little. ( ex. Incandescent Lamp. Fluorescent Lamp. Halogen Lamp. White LED. Sun Light )
10) It is possible to select 2 type of I
11) Adjustable measurement result for influence of optical window ( It is possible to detect min. 0.33 lx, max. 100000 lx by
using this function. )
Small measurement variation (+/- 15%)
12)
● Applications
Mobile phone, LCD TV, NOTE PC, Portable game machine, Digital camera, Digital video camera, Car navigation, PDA,
LCD display
● Absolute Maximum Ratings
Parameter
Supply Voltage
Operating Temperature
Storage Temperature
SDA Sink Current
Power Dissipation
70mm × 70mm × 1.6mm glass epoxy board. Derating in done at 3.47mW/℃ for operating above Ta=25℃.
※
● Operating Conditions
Parameter
VCC Voltage
2
I
C Reference Voltage
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TECHNICAL NOTE
2
C bus interface. This IC is the most suitable to obtain the ambient
2
C slave-address.
Symbol
Limits
Units
Vmax
4.5
Topr
-40～85
Tstg
-40～100
Imax
7
Pd
260
※
Symbol
Min.
Typ.
Vcc
2.4
3.0
VDVI
1.65
－
V
℃
℃
mA
mW
Max.
Units
3.6
V
VCC
V
June 2008
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Related Manuals for Rohm BH1715FVC
Summary of Contents for Rohm BH1715FVC
- Page 1 BH1715FVC ● Descriptions BH1715FVC is an digital Ambient Light Sensor IC for I C bus interface. This IC is the most suitable to obtain the ambient light data for adjusting LCD and Keypad backlight power of Mobile phone. It is possible to detect wide range at High resolution.
- Page 2 ● Electrical Characteristics ( VCC = 3.0V, DVI = 3.0V, Ta = 25℃, unless otherwise noted ) Parameter Symbol Min. Typ. Max. Units Conditions Supply Current Icc1 Ev = 100 lx － ※ Powerdown Current Icc2 － 0.01 No input Light Peak Wave Length λp －...
- Page 3 ● Reference Data 100000 10000 1000 H-Res. L-Res. H-Res. L-Res. 1000 10000 100000 1000 1100 Illuminance [ lx ] Illuminance [ lx ] Wavelength [ nm ] Fig.3 Illuminance – Fig.2 Illuminance – Fig.1 Spectral Response Measurement Result 2 Measurement Result 1 1pin 受信指向角特性...
- Page 4 ● Block Diagram Logic C Interface ADDR ● Block Diagram Descriptions Photo diode with approximately human eye response. Integration-OPAMP for converting from PD current to Voltage. AD converter for obtainment Digital 16bit data. Logic + I C Interface Ambient Light Calculation and I C BUS Interface.
- Page 5 ● Instruction Set Architecture Instruction Opecode Comments Power Down 0000_0000 No active state. Power On 0000_0001 Waiting for measurement command. Reset Data register value. Reset command is not acceptable in Reset 0000_0111 Power Down mode. Start measurement at 1lx resolution. Continuously H-Resolution Mode 0001_0000 Measurement Time is typically 120ms.
- Page 6 ● Timing chart for VCC and DVI power supply sequence DVI is I C bus reference voltage terminal. And it is also asynchronous reset terminal. It is necessary to set to 'L' after VCC is supplied. In DVI 'L' term, internal state is set to Power Down mode. １）...
- Page 7 ●Measurement sequence example from "Write instruction" to "Read measurement result" ex1) Continuously H-resolution mode ( ADDR = 'L' ) from Slave to Master from Master to Slave ① Send "Continuously H-resolution mode " instruction 0100011 00010000 ② Wait to complete 1st H-resolution mode measurement.( max. 180ms. ) ③...
- Page 8 I2C bus as it finishes being satisfactory. Moreover, the description concerning the terminal ADDR is omitted. Please refer to the paragraph of "Timing chart for VCC and DVI power supply sequence" about the terminal ADDR design. ex 1) The control signal line such as CPU is connected. BH1715FVC Micro 0.1uF ADDR Controller 0.1uF...
- Page 9 This method has the possibility that the Reset section of turning on the power supply can not satisfied. cannot be satisfied. Please design the set considering the characteristic of the power supply enough. R1 : 1kOhm BH1715FVC 0.1uF ADDR C1 : 1uF...
- Page 10 ADDR = ‘H’ ( ADDR ≧ 0.7VCC ) → “1011100“ ADDR = 'L' ( ADDR ≦ 0.3VCC ) → “0100011“ 3 ) Write Format BH1715FVC is not able to accept plural command without stop condition. Please insert SP every 1 Opecode. Slave Address Opecode...
- Page 11 ● Adjust measurement result for influence of optical window. BH1715FVC is including in adjust measurement result function for influence of optical window. Adjust is done by changing measurement time. For example, if transmission rate by optical window is 1 / N, then adjust is done by measurement time is set to "initial value * N".
- Page 12 'L' ( at least 1us, DVI <= 0.4V ) after VCC is 150kOhm supplied. BH1715FVC is pulled down by 150kOhm while DVI = 'L'. C bus Interface SCL Terminal ※ These values are design-value, not guaranteed.
- Page 13 ● Package Outlines Lot No. Production code WSOF6 ( Unit : mm ) ● About an optical design on the device 0.8 mm 1.3 mm Min.0.4 mm Min.0.4 mm PD area ( 0.25 mm x 0.3 mm ) Please design the optical window so that light can cover at least this area.
- Page 14 ● Cautions on use 1) Absolute Maximum Ratings An excess in the absolute maximum ratings, such as supply voltage ( Vmax ), temperature range of operating conditions ( Topr ), etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit.
- Page 15 X X X X X X Direction of feed 1Pin (Unit:mm) ※When you order , please order in times the amount of package quantity. Catalog No.08T164A '08.6 ROHM © 1000 NZ 15 / 15 Downloaded from Elcodis.com electronic components distributor...
- Page 16 ROHM cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the NOTES specified in this catalog.
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